On Mon, 2017-09-25 at 21:26 +0100, Chris Wilson wrote:
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> benchmarks/gem_syslatency.c | 86 +++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 83 insertions(+), 3 deletions(-)
>
> diff --git a/benchmarks/gem_syslatency.c b/benchmarks/gem_syslatency.c
> index 4ed23638..b8788497 100644
> --- a/benchmarks/gem_syslatency.c
> +++ b/benchmarks/gem_syslatency.c
> @@ -29,6 +29,7 @@
> #include <stdio.h>
> #include <string.h>
> #include <fcntl.h>
> +#include <ftw.h>
> #include <inttypes.h>
> #include <pthread.h>
> #include <sched.h>
> @@ -51,6 +52,7 @@ static volatile int done;
> struct gem_busyspin {
> pthread_t thread;
> unsigned long count;
> + bool leak;
> };
I know we all binary arithmetic, but can I still ask
#define M()
#define K()
Or something.
>
> struct sys_wait {
> @@ -93,6 +95,7 @@ static void *gem_busyspin(void *arg)
> struct gem_busyspin *bs = arg;
> struct drm_i915_gem_execbuffer2 execbuf;
> struct drm_i915_gem_exec_object2 obj;
> + const unsigned sz = bs->leak ? 16 << 20 : 4 << 10;
Beause, this is quite OK still.
> @@ -180,6 +188,33 @@ static void *sys_wait(void *arg)
> return NULL;
> }
>
> +static void *sys_thp_alloc(void *arg)
> +{
> + struct sys_wait *w = arg;
> + struct timespec now;
> +
> + clock_gettime(CLOCK_MONOTONIC, &now);
> + while (!done) {
> + const size_t sz = 2 << 20;
> + const struct timespec start = now;
> + void *ptr;
> +
> + ptr = mmap(NULL, sz,
> + PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS,
> + -1, 0);
> + assert(ptr != MAP_FAILED);
> + madvise(ptr, sz, MADV_HUGEPAGE);
> + for (int page = 0; page < 2 << 20 >> 12; page++)
> + *((volatile uint32_t *)ptr + (page << 12 >> 2)) = 0;
But what's the point in this iteration, we iterate from 0 to 512 page
index (sz/PAGE_SIZE would be so much easier) and then write to to not
each page but interleave four page writes per page and 3/4 of pages
never get written? If this is intentional, please drop a comment.
Other than that,
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Regards, Joonas
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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